emulsion

1any mixture of liquids that do not normally mix together, such as oil and waterReduce the heat until the mixture becomes a thick butter-wine emulsion.The test solutions were prepared in emulsion form.

2(alsoemulsion paint)(British English)a type of paint used on walls and ceilings that dries without leaving a shiny surfaceThey gave the walls a coat of white emulsion.

3(specialist)a substance on the surface of photographic film that makes it sensitive to lightphotographic/film emulsion

Word Originearly 17th cent. (denoting a milky liquid made by crushing almonds in water): from modern Latinemulsio(n-), from the verb emulgere